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Article: Optimal and robust design of docking blocks with uncertainty
Title | Optimal and robust design of docking blocks with uncertainty |
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Authors | |
Keywords | Convex model Docking blocks Optimal design Robust design Uncertainty |
Issue Date | 2004 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstruct |
Citation | Engineering Structures, 2004, v. 26 n. 4, p. 499-510 How to Cite? |
Abstract | The positioning and stiffness allocation of docking blocks are an important decision when docking a ship. In this paper, the issues of both optimal design and robust design of docking blocks with uncertainty are discussed, and the corresponding mathematical models are proposed. To describe the uncertainties of various parameters, the proposed method employs the convex model in which the indeterminacy about the uncertain variables is expressed in terms of some sets to which these uncertain variables belong. In the optimisation of docking blocks, the factors considered include the uncertain ship girder loads and uncertain equivalent stiffnesses of blocks. Numerical examples show that uncertainties do affect the optimal solution and lead to an increase in volume of blocks compared to that from deterministic optimisation. A method of robust design with respect to the uncertain equivalent stiffnesses of blocks is also proposed. The robustness of the objective function is achieved by minimising the maximum value of unsatisfactory degree functions of the uncertainty parameters while the feasibility robustness is ensured by an optimisation conducting the worst-case analysis at a lower level. Numerical simulations show that the optimal result from minimisation of the maximum value of unsatisfactory degree functions is superior to that from direct maximisation of the minimum value of uncertainty parameters without the use of unsatisfactory degree functions. © 2003 Elsevier Ltd. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/71158 |
ISSN | 2023 Impact Factor: 5.6 2023 SCImago Journal Rankings: 1.661 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Cheng, YS | en_HK |
dc.contributor.author | Au, FTK | en_HK |
dc.contributor.author | Tham, LG | en_HK |
dc.contributor.author | Zeng, GW | en_HK |
dc.date.accessioned | 2010-09-06T06:29:26Z | - |
dc.date.available | 2010-09-06T06:29:26Z | - |
dc.date.issued | 2004 | en_HK |
dc.identifier.citation | Engineering Structures, 2004, v. 26 n. 4, p. 499-510 | en_HK |
dc.identifier.issn | 0141-0296 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/71158 | - |
dc.description.abstract | The positioning and stiffness allocation of docking blocks are an important decision when docking a ship. In this paper, the issues of both optimal design and robust design of docking blocks with uncertainty are discussed, and the corresponding mathematical models are proposed. To describe the uncertainties of various parameters, the proposed method employs the convex model in which the indeterminacy about the uncertain variables is expressed in terms of some sets to which these uncertain variables belong. In the optimisation of docking blocks, the factors considered include the uncertain ship girder loads and uncertain equivalent stiffnesses of blocks. Numerical examples show that uncertainties do affect the optimal solution and lead to an increase in volume of blocks compared to that from deterministic optimisation. A method of robust design with respect to the uncertain equivalent stiffnesses of blocks is also proposed. The robustness of the objective function is achieved by minimising the maximum value of unsatisfactory degree functions of the uncertainty parameters while the feasibility robustness is ensured by an optimisation conducting the worst-case analysis at a lower level. Numerical simulations show that the optimal result from minimisation of the maximum value of unsatisfactory degree functions is superior to that from direct maximisation of the minimum value of uncertainty parameters without the use of unsatisfactory degree functions. © 2003 Elsevier Ltd. All rights reserved. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/engstruct | en_HK |
dc.relation.ispartof | Engineering Structures | en_HK |
dc.subject | Convex model | en_HK |
dc.subject | Docking blocks | en_HK |
dc.subject | Optimal design | en_HK |
dc.subject | Robust design | en_HK |
dc.subject | Uncertainty | en_HK |
dc.title | Optimal and robust design of docking blocks with uncertainty | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0141-0296&volume=26&spage=499&epage=510&date=2004&atitle=Optimal+and+robust+design+of+docking+blocks+with+uncertainty | en_HK |
dc.identifier.email | Au, FTK:francis.au@hku.hk | en_HK |
dc.identifier.email | Tham, LG:hrectlg@hkucc.hku.hk | en_HK |
dc.identifier.authority | Au, FTK=rp00083 | en_HK |
dc.identifier.authority | Tham, LG=rp00176 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.engstruct.2003.11.007 | en_HK |
dc.identifier.scopus | eid_2-s2.0-1442338345 | en_HK |
dc.identifier.hkuros | 93032 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-1442338345&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 26 | en_HK |
dc.identifier.issue | 4 | en_HK |
dc.identifier.spage | 499 | en_HK |
dc.identifier.epage | 510 | en_HK |
dc.identifier.isi | WOS:000220048000007 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Cheng, YS=7404911293 | en_HK |
dc.identifier.scopusauthorid | Au, FTK=7005204072 | en_HK |
dc.identifier.scopusauthorid | Tham, LG=7006213628 | en_HK |
dc.identifier.scopusauthorid | Zeng, GW=7202802813 | en_HK |
dc.identifier.issnl | 0141-0296 | - |